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# If * represents one of the operations +, -, x, is

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Manager
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Joined: 05 Jun 2011
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Location: Shanghai China
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If * represents one of the operations +, -, x, is [#permalink]

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31 Jul 2011, 04:17
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If * represents one of the operations +, -, x, is K*(1+m)=(K*1)+(K*m) for all numbers K, 1 and m?

(1) K*1 is not equal to 1*k for some numbers K
(2) * represents substraction

why (1) is correct????
[Reveal] Spoiler: OA
Manager
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Re: DS problem pls help me to explain the problem~ Thank u~(5) [#permalink]

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31 Jul 2011, 06:23
1). K*1 is not equal to 1*k => * is not + or *. Therefore it should be (-)
so K-(1+m)= is not equal to (K-1)+(K-m)...sufficient

2).* represents subtraction...so K-(1+m)= is not equal to (K-1)+(K-m)...sufficient

both alone are sufficient...so D
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Kaustubh

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Re: DS problem pls help me to explain the problem~ Thank u~(5) [#permalink]

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01 Aug 2011, 01:37
Yes, I got it. The substraction only fits this equation.

quote="mehtakaustubh"]1). K*1 is not equal to 1*k => * is not + or *. Therefore it should be (-)
so K-(1+m)= is not equal to (K-1)+(K-m)...sufficient

2).* represents subtraction...so K-(1+m)= is not equal to (K-1)+(K-m)...sufficient

both alone are sufficient...so D[/quote]
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Re: DS problem pls help me to explain the problem~ Thank u~(5) [#permalink]

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01 Aug 2011, 07:41
1. Sufficient

k*1 != 1*k

=> this can only be subtraction.

if its subtraction ,k*(1+m) != k*1 + k*m

2. Sufficient
if its subtraction ,k*(1+m) != k*1 + k*m

Re: DS problem pls help me to explain the problem~ Thank u~(5)   [#permalink] 01 Aug 2011, 07:41
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